4. Phytophthora, Oomycete
not a true fungus
Hyphae
Chlamydospores
Sporangia
Antheridia/oogonia
Zoospores
Cell walls contain cellulose
Usually has 2n chromosomes
13. Phytophthora cactorum
P. citrophthora
P. citricola
P. cryptogea
P. drechsleri
P. lateralis
P. megasperma
P. parasitica
P. syringae
P. nicotianae
P. ramorum
…many more
top diebacks, leaf spots, stem cankers
14. Many Phytophthora species have a wide host range:
Phytophthora cinnamomi
infects 900 different species
43. Phytophthora
detection
Phytophthora species in general:
Antibody test (ELISA)
Semi-selective media
ELISA
Plating
Specific Phytophthora
(P. ramorum)
Nested PCR DNA test
Photo: Natalie Goldberg, New Mexico State University
PCR
45. If you collect a sample
Collect various stages
of symptoms.
Photo symptoms and
environment.
46. Packaging a sample
DRY paper towel
Double bag and seal
Crush proof box
Sample submission form
outside of bags
Overnight express
Monday-Thursday